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Accession Number:
AD0832766
Title:
An Analysis of the Internal Leakage Characteristics of Certain Marotta Valves
Report Date:
1965-12-01
Abstract:
Excessive internal leakage of certain models of valves had generated an inordinate number of problems during field and qualification testing. Regular failure analysis of these problems did not disclose the basic cause of leakage, but revealed functional characteristics suggestive of further examination. Therefore, these valves were subjected to special tests for the purpose of obtaining data that would further define the cause of failures. Results of the special tests revealed that plastic flow (distortion) of valve seats was the basic cause of internal leakage, and that the plastic flow was caused by a combination of the thermal effect of valve cycling and the extreme force of the poppet striking the valve seat.
Document Type:
Conference:
Journal:
Pages:
17
File Size:
1.65MB
Contracts:
Grants:
Distribution Statement:
Approved For Public Release
